(a) How do quadruples swin naturally with head on water?
(b) Distinguish between density and specific gravity.

Explanation

(a) In case of a quadruply, the front part of its body is lighter than the hinder parts.
(b) Specific gravity (relative density) of a substance is the ratio of its density of the density of water at `4^@C`.
Density of a substance`=`its specific gravity`xx1000(kg)/(m^3)`.